E$2-$ Write a simple Pythor program that uses a while$-$loop to compute erf $(x)($the error function$)$ from the MacLaurin Series expansion given in the equation below. Exit the while loop when the estimated error is below a tolerance of two times the machine precision.

erf$(x)=\frac{2}{\sqrt[\phantom{2}]{}}(x-\frac{x^3}{3}+\frac{x^5}{5*2!}-\frac{x^7}{7*3!}+$dots$)$